Application of 3D heteroatom-doped graphene in adsorptive removal of water pollutants: Review on hydrothermal synthesis and its influencing factors

Wan Ting Tee, Nicholas Yung Li Loh, Kar Chiew Lai, Billie Yan Zhang Hiew, Suyin Gan, Lai Yee Lee

Research output: Contribution to journalReview articlepeer-review

16 Citations (Scopus)
71 Downloads (Pure)

Abstract

Graphene in its various forms including three-dimensional (3D) structure has recently garnered considerable recognition due to its unique physicochemical and mechanical attributes. Specifically, its ultra-large surface area, tunable surface functionalities, abundant adsorption mechanisms and enhanced practical handling have endowed graphene as a prospective adsorbent for environmental remediation. Heteroatom doping offers a promising approach for improving the adsorption properties of the nanomaterial. Thus, this review examines the potential of heteroatom-graphene adsorption systems in removing harmful aqueous pollutants. Here, the adsorption kinetic, equilibrium and thermodynamics of heteroatom-doped graphene structures are discussed. The involvement of adsorption mechanisms such as π-π stacking, hydrogen bonding, electron donor-acceptor, hydrophobic and electrostatic interactions in sequestrating the pollutants are also reviewed. Additionally, the state-of-the-art assessment on the enhancement of adsorption properties induced by heteroatom doping such as new functional groups with changeable charge, expandable interlayer spacing, larger surface area and wettability is presented. Thereafter, the review focuses on hydrothermal synthesis of heteroatom-doped 3D graphene, a facile and scalable method which has received very limited attention to date. The hydrothermal governing parameters are discussed and evaluated with respect to the physicochemical and adsorption properties of the doped graphene. The utilization of density functional theory calculations to model 3D heteroatom-doped graphene systems for wastewater remediation is also studied. Finally, the review summarizes the current developments and identifies the challenges associated with hydrothermally synthesized 3D heteroatom-doped graphene for future work. Overall, this study provides valuable insights into the use of heteroatom-doped graphene adsorbents for aqueous pollutants removal as well as the strengths of heteroatom doping and hydrothermal synthesis in enhancing their adsorption efficacy.

Original languageEnglish
Article number124072
JournalSeparation and Purification Technology
Volume320
Early online date12 May 2023
DOIs
Publication statusPublished - 1 Sept 2023

Keywords

  • Adsorption
  • Heteroatom-doped graphene
  • Hydrothermal
  • Three-dimensional graphene
  • Wastewater treatment

ASJC Scopus subject areas

  • Analytical Chemistry
  • Filtration and Separation

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